If it was, we couldn't adjust to seasonal differences in the length of nights and days.

如果是，我们就不能适应一年四季中不同的昼夜时间差。

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The revised International Health Regulations have received intense attention during the last few months and, as many here will attest, during the last few nights and days.

最近几个月中，以及如在场的许多人都可证明的，在最近几天几夜中，对《国际卫生条例》修订稿给予了认真关注。

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Unlike on earth, with its cycle of nights and days and where there can be clouds, sunshine in space is practically constant - aside from a few days around the spring and autumn equinoxes.

不像在地球上，有日夜交替，有云遮雾绕，太空中的阳光几乎永恒不变——除了在春分秋分的那几天之外。

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Upon This Chessboard of Nights and Days, Voices from Texas Death Row is available for purchase in bookstores as well as online.

VOA: standard.2009.10.21

Experts say warm days, cool nights and a medium soil temperature are the best conditions for growing carrots that taste great.

VOA: special.2009.02.24

Many more days and nights passed with father and son saying nothing to each other.

VOA: special.2009.03.07

The result: For a terrifying five nights and four days survivors had to fend off numerous shark attacks that took the lives of hundreds of these men.

FORBES: Fact and Comment

Our planned route took us, over two nights and three days, from the rustic Wild River Campground, along Meader Ridge, over the rock-strewn Carter Dome and along winding trails skirting Moriah Brook and Wild River back to our starting point.

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Max sailed in and out of days and nights.

NEWYORKER: Max at Sea